forecast.css: Comment out overflow-x: auto

I commented out overflow-x in .fe_days because I could drag the element all over the place on mobile.

![screen shot 2014-07-03 at 11 04 17 pm](https://cloud.githubusercontent.com/assets/81969/3477951/3b6c8382-0328-11e4-801a-093f685e74ba.png)

![img_0061](https://cloud.githubusercontent.com/assets/81969/3477956/49abbefe-0328-11e4-9b52-866319ca6717.PNG)

(I converted the tabs into spaces too if that's okay)

CC @bsstoner